963
FXUS66 KSGX 212349
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
449 PM PDT TUE APR 21 2026
SYNOPSIS
GUSTY WINDS OVER THE MOUNTAINS AND DESERTS AND LIGHT PRECIPITATION
IN THE COASTAL BASIN EXPECTED THIS AFTERNOON INTO EARLY WEDNESDAY
MORNING. THURSDAY WILL BE A LITTLE WARMER AND DRY WITH WEAKER WINDS.
COOLER CONDITIONS LIKELY THIS WEEKEND, WITH PERIODS OF INCREASED
WINDS AND ANOTHER ROUND OF LIGHT PRECIPITATION WEST OF THE
MOUNTAINS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
NEW AVIATION AND MARINE DISCUSSION
A TROUGH OF LOW PRESSURE IS EXPECTED TO MOVE EAST ACROSS CENTRAL
CALIFORNIA TODAY INTO WEDNESDAY. VISIBLE SATELLITE AT 11 AM WAS
SHOWING CLOUDS MOVING INTO ORANGE COUNTY, CLOUDS ARE EXPECTED TO
SPREAD SOUTH AND EAST ACROSS THE AREA. ADDITIONALLY, AREAS OF LIGHT
RAIN WILL SPREAD SOUTH AND EAST ACROSS THE AREA THIS AFTERNOON AND
EVENING. ACCUMULATIONS OF 0.10" OR LESS ARE EXPECTED IN THE COAST
AND VALLEYS, WITH TOTALS UP TO 0.25" ON THE COASTAL SLOPES OF THE
MOUNTAINS. THE SAN BERNARDINO COUNTY MOUNTAINS ARE THE MOST LIKELY
PLACE TO SEE ACCUMULATIONS UP TO 0.25". RAINFALL RATES ARE EXPECTED
TO BE 0.10" OR LESS PER HOUR. DRY CONDITIONS WILL RETURN BY MID-
WEDNESDAY MORNING.
SOUTHWEST TO WEST WINDS HAVE ALREADY STARTED TO WEAKEN, WITH GUSTS
TO 45 MPH BEING OBSERVED THROUGH THE SAN GORGONIO PASS AT 11 AM.
WINDS WILL PEAK IN STRENGTH THIS EVENING. STRONGEST WINDS WILL BE
OVER THE MOUNTAINS AND INTO THE DESERTS. PEAK GUSTS OF 40 TO 60 MPH
EXPECTED, WITH A FEW ISOLATED GUSTS TO 65 MPH ON THE NORTHERN SLOPES
OF THE SAN BERNARDINO MOUNTAINS. WINDS WILL DECREASE THROUGH THE DAY
WEDNESDAY WITH GUSTS MAINLY 35 TO 45 MPH, LOCALLY UP TO 55 MPH
THROUGH WIND PRONE PASSES LIKE THE SAN GORGONIO PASS.
DRY AND WARMER CONDITIONS EXPECTED ON THURSDAY. HIGHS ALONG THE
COAST WILL BE A FEW DEGREES WARMER, WITH INLAND LOCATIONS UP TO 7
DEGREES WARMER THAN WEDNESDAY. THE TEMPERATURE INCREASE WILL BRING
CONDITIONS NEAR TO SLIGHTLY ABOVE NORMAL FOR THIS TIME OF YEAR.
ANOTHER AREA OF LOW PRESSURE LOOKS LIKELY TO MOVE ACROSS THE US WEST
COAST FOR THE UPCOMING WEEKEND. WHILE THERE REMAINS SOME TIMING
DIFFERENCES BETWEEN THE GLOBAL MODELS, THE TROUGH WILL BRING ANOTHER
ROUND OF COOLER CONDITIONS, INCREASE IN WESTERLY WINDS, AND
POTENTIAL FOR LIGHT PRECIPITATION. DRY AND WARMER FOR NEXT MONDAY,
WITH HIGH TEMPERATURES FOR INLAND AREAS STILL A FEW TO AROUND 5
DEGREES BELOW AVERAGE.
AVIATION
220000Z...COAST/VALLEYS...A BAND OF LOW CLOUDS IS CURRENTLY MOVING
INTO WESTERN PORTIONS OF THE COASTAL BASIN. GENERALLY VFR CONDITIONS
EXPECTED WITH BASES 3-5 KFT. HOWEVER, ISO -SHRA COULD BRIEFLY CREATE
MVFR VIS AND CIGS 1500-2500 FT MSL FROM NOW THROUGH 04Z WED AS THEY
PASS OVER SITES. CLOUDS MOSTLY SCATTER OUT FROM NORTHWEST TO
SOUTHEAST AFTER THE BAND, THOUGH PATCHY BKN CIGS AROUND 3-5 KFT MAY
LINGER THROUGH THE OVERNIGHT HOURS, PARTICULARLY IN SAN DIEGO
COUNTY. OTHERWISE, STRONG LOW-LEVEL WINDS WILL ALLOW FOR MODERATE
UP/DOWNDRAFTS TO PERSIST DOWNWIND OF THE SANTA ANA MTNS (I.E KRAL,
KSBD) THROUGH EARLY WEDNESDAY MORNING.
MOUNTAINS/DESERTS...STRONG SOUTHWEST TO WEST WINDS ARE CURRENTLY
GUSTING 35-45 KTS WIDESPREAD WITH LOCAL GUSTS TO 55 KTS THROUGH
PASSES AND ALONG DESERT SLOPES. ISOLATED VIS REDUCED BY BLDU IN THE
DESERTS AND MODERATE/STRONG UP/DOWNDRAFTS IN LEE OF MOUNTAINS. WINDS
DECREASE SLOWLY AFTER 06Z, BUT REMAIN BREEZY FOR THE DESERT SLOPES
AND MTN PASSES. WINDS STRENGTHEN AGAIN WEDNESDAY AFTERNOON, THOUGH
NOT AS STRONG AS TODAY WITH GUSTS 25-35 KTS, LOCALLY 40 KTS THROUGH
PASSES AND ALONG DESERT SLOPES.
MARINE
WESTERLY TO NORTHWESTERLY WINDS WILL INCREASE WEDNESDAY AFTERNOON
THROUGH LATE WEDNESDAY NIGHT WITH GUSTS 20-25 KNOTS LIKELY FOR OUTER
COASTAL WATERS. THESE WINDS COULD GENERATE CHOPPY AND HAZARDOUS
CONDITIONS. MORE DETAILS CAN BE FOUND IN THE SMALL CRAFT ADVISORY.
WINDS DIMINISH EARLY THURSDAY MORNING BEFORE BRIEFLY INCREASING
AGAIN IN THE OUTER COASTAL WATERS THURSDAY AFTERNOON, WITH PEAK
GUSTS AROUND 20 KNOTS. OTHERWISE, NO HAZARDOUS MARINE CONDITIONS ARE
EXPECTED THROUGH SATURDAY.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...WIND ADVISORY UNTIL 7 AM PDT WEDNESDAY FOR APPLE AND LUCERNE
VALLEYS-RIVERSIDE COUNTY MOUNTAINS-SAN BERNARDINO COUNTY
MOUNTAINS-SAN DIEGO COUNTY DESERTS-SAN DIEGO COUNTY
MOUNTAINS-SAN GORGONIO PASS NEAR BANNING.
PZ...SMALL CRAFT ADVISORY FROM 3 PM WEDNESDAY TO 3 AM PDT THURSDAY
FOR WATERS FROM SAN MATEO POINT TO THE MEXICAN BORDER
EXTENDING 10 TO 60 NM OUT INCLUDING SAN CLEMENTE ISLAND.
PUBLIC...CO
AVIATION/MARINE...KW
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